机械不完全燃烧损失
参考答案：
燃料在锅炉内燃烧，由于部分固体颗粒未能燃尽而被烟气带走或落入冷灰斗中造成的损失。
看图，用适当的单词完成对话。
1. A: _____ _____ are your black _____ ?
B: They are ten dollars.
2. A: _____ is your brother?
B: He is _____ the tree.
3. A: When is your_____ ?
B: It's October seventh. And today is October seventh.
A: Oh! _____ _____ to you!
B：Thank you.
4. A: What _____ of movies does her grandmother like?
B: She likes Beijing _____.
神经冲动在神经细胞间的传递是通过完成的（）
A.突触
B.突触小体
C.突触前膜
D.突触后膜
